More medal joy for Britain?
Gemma Spofforth and Lizzie Simmonds are going in the 100m backstroke while Liam Tancock's is going in the men's race.
Russian Anastasia Zueva, who broke the world record in the semis, is hot favourite to land the women's crown.
Zueva wore the Arena suit, with all 11 records broken so far by swimmers who have worn the 100% polyurethane suit.
Spofforth wears a part-polyurethane suit and reckons the suits are not responsible for the world-record performances in Rome.
"If you've done the work, you can do it in any suit," said the 21-year-old.
Tancock is going in the men's final after taking the last spot away from world record holder Aaron Peirsol - Peirsol appeared to play it too cool in the semis.
Let us not forget arguably the race of the night as Phelps (part-polyurethane) goes up against the favouite from Germany Paul Biedermann (100% polyurethane).
Men's 200m free
Women's 100m back
Women's 1500m free
Men's 100m back
Women's 100m breaststroke
Thoughts and predictions please.